Annunciator



(No Model.)

I F. E. FISHER.

ANNUNGIATOR.

Patented Oct. 22, 1889.

FIG. 2.

INVENTOR- A MW Q mrzvzsszs PM o LiNIogr-lphlbr. mum-pm a, r.

UNITED STATES PATENT OFFICE.

FRANK E. FISHER, OF DETROIT, MICHIGAN.

ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 413,504, dated October22, 1889.

Application filed June 6, 1889. gerial No. 313,342. (No model.)

To to whom it may concern.-

Be it known that I, FRANK E. FISHER, of Detroit, in the county of Wayneand State of Michigan, have invented a new and useful Improvement inAnnunciators, of which the following is a specification.

This invention relates to that type of annunciators for which LettersPatent No. 383,566 were issued to me May 29, 1888,-and has for itsobject to provide novel means whereby the indicating-needle can beoperated with a feebler'current of electricity than where the armatureis secured to one end of a rotary shaft. To accomplish this object myinvention involves a novel construction and arrangement or combinationof devices and principles of operation, which are hereinafter fullydescribed in detail, and specifically set forth in the claims, referencebeing made to the accompanying drawings, in which- Figure 1 is avertical section; Fig. 2, a rear elevation of the rear end of theelectro-magnet. Fig. 8 is a rear elevation of the diamagnetic plate andits pole-piece; Fig. 4, a rear elevation of the armature-shaft withneedle and frame 5 and Fig. 5 is a side elevation of the same.

A. represents the face-plate of the annunciator, and B represents thecore of an electro-magnet, which is secured to the face-plate in anydesired way, as illustrated by the screw 0.

E represents the bobbin on the core of the electro-magnet, and D Frepresent two polepieces secured tothe core B at its ends. The rear endof the core is formed into a detent, as shown at H.

G represents a diamagnetic plate secured to the core B, and having adownward extension, in which is a slot M, Fig. 3.

K represents the axiallyoscillatory armature. consisting of a rod orwire of magnetic metal, journaled in a hole N in the faceplate A and inthe slot M in the diamagnetic plate G. On one end of the armature K issecured a needle L, and on the other end is secured a diamagnetic frameI, having therein a ratchet-tooth O, and having a counter weight Pextending from one s1de thereof. The upper edge of the slot M-in theplate G is a trifle below the surface of pole-piece F, so that thearmature K in rising cannot come in contact with said polepiece andstick thereto.

The operation of my invention is as follows: The parts being in theposition shown in Figs. 1 and 2, the detent H on the core B engages withthe tooth O on frame I, and is held in engagement therewith by theweight of the oscillatory armature K and frame I. When anelectro-current is passed through the bobbin E, the pole-pieces D Fbecome magnetized and attract the armature K and bodily raise it untilthe tooth O is disengaged from the detent H, when the counter weight Pcauses the armature K to partially rotate and the needle L to indicateits proper number. i

As shown in the drawings, the side of the frame I limits the rotation ofthe armature K by coming in contact with detent H; but this may beobtained in various ways. It is evident that in this construction ,I getthe benefit of the attraction of both ends of the magnet directly uponthe axially-oscillatory armature, and by making this armature carry theneedle I attain the desired result with a feebler current of electricitythan if the armature were a mere attachment to a shaft and acted on byonly one pole of the magnet.

Vt hat I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination, in an annunciator, of

an electro magnet and an axially-oscillatory a face-plate, anelectro-magnet comprising a detent, a diamagnetic plate extending belowthe magnet and having a slot, and an axiallyoseillatory armaturejournaled in the :faceplate and diamagnetie plate, carrying a needle atone end and a toothed frame at the other end, and extending beneath andbodily raised by the two poles of the magnet, sub stantially asdescribed.

FRANK E. FISHER.

Witnesses:

CYRUS E. LOTHROP, ADELAIDE A. ANDERSON.

